Opening downloaded zip file creates cpgz file?

Question

If I make the url for a zip file the href of a link and click the link, my zip file gets downloaded and opening it gets the contents as I expect.

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Answer 1

You're passing the URL to readfile() like:

$archive = 'https://mysite.com/uploads/my-archive.zip';

While you should pass the path on the server, for example:

$archive = '/uploads/my-archive.zip';

Assuming the file is located in the upload folder.

Additionally try the following headers:

header("Content-type: application/octet-stream"); 
header("Content-disposition: attachment; filename=file.zip");